NEET 2010 Physics question
An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of . The mass per unit length of water in the pipe is . What is the power of the engine?
Answer: (4)
Solution
Mass per unit length and water speed . Mass flowing out per second . The force needed to give this water momentum is the rate of change of momentum: . Power v^3$ = 100 ×
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